Origin of nucleosynthetic isotope heterogeneity in the solar protoplanetary disk

A Trinquier, TR Elliott, CD Coath, D. Ulfbeck, [No Value] Krot A. N., M. Bizzarro

Research output: Contribution to journalArticle (Academic Journal)peer-review

442 Citations (Scopus)

Abstract

Stable-isotope variations exist among inner solar system solids, planets, and asteroids, but their importance is not understood. We report correlated, mass-independent variations of titanium-46 and titanium-50 in bulk analyses of these materials. Because titanium-46 and titanium-50 have different nucleosynthetic origins, this correlation suggests that the presolar dust inherited from the protosolar molecular cloud was well mixed when the oldest solar system solids formed, but requires a subsequent process imparting isotopic variability at the planetary scale. We infer that thermal processing of molecular cloud material, probably associated with volatile-element depletions in the inner solar system, resulted in selective destruction of thermally unstable, isotopically anomalous presolar components, producing residual isotopic heterogeneity. This implies that terrestrial planets accreted from thermally processed solids with nonsolar isotopic compositions.
Translated title of the contributionOrigin of nucleosynthetic isotope heterogeneity in the solar protoplanetary disk
Original languageEnglish
Pages (from-to)374-376
Number of pages3
JournalScience
Volume324
Issue number5925
DOIs
Publication statusPublished - Apr 2009

Bibliographical note

Publisher: AMER ASSOC ADVANCEMENT SCIENCE

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